Trimming machine



Sept. 2, 1952 A. GREENBAUM l 2,609,046

TRIMMING MACHINE' Filed April 17, 1946 5 Sheets-Sheet 1 l I g L INVENTDR.

ARTHUR GREENBAUM WMMQMJZ ATTORN EYS Sept. 2, 1952 A. GREENBAUM TRIMMING MACHINE Filed April 17, 194e 5 Sheets-Sheet 2 FIG. 2

O INVENTOR.

ARTHUR GREENBAUM AT ORNEYS Sept. 2, 1952 A. GREENBAUM TRIMMING MACHINE 5 Sheets-Sheet 3 Filed April 17, 1946 IN1/Emo -ARTHUR GREENBAUM BY saw AT ORNEYS A. GREENBAUM TRIMMING MACHINE Sept. 2, 1952 5 Sheets-Sheet 4 Filed April 17, 1946 INVENTOR. ARTHUR GREENBAUM f/slpm ATTORNEYS Sept. 2, 1952 A. GREENBAUM 2,609,046

TRIMMING MACHINE Filed April 17, 1946 5 Shees-Sheet 5 Ia 12o I :Y

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lFIC-5.9 nvVENroR.

V' i ARTHUR GREENBAUM FIG. es NM "AWM ATTORNEYl Patented Sept. 2, 1952 TRlMMlNG Arthur:l Greenbaumi Revere;` Massa. assigner: to

Americanfiltrite; Rubber Co. Inc., Stoughton, lilass;g aacprpnration Off Massachusetts; Y

Application Apriii 17, 1946, .sjerialfNm 662,896 @Cla-imei. (Cl. 164%2031 -Tnepresent inventiomrelatestotrimmingma c hines for rubber articles and more particularlyA for4 machines for4v trimmingl'shoe bottoms suchas' heels andisoles.l v A lInfthemanufactur-e off molded.I rubber articles such as rubberl heels, the'projecting-marginal Whichfisfleft as-a conseclnenceoiA the rnol'dingoperation is usuallyI removed; Icy-manually-presenting they heel-'f toa revolving knife; Thisv operation frequentlyresultsin a non-uniformproduet it` requires skilled laborand` is expensive:

' VTlieoloject'oftlfxepresent invention istol provide 'an-automatic machine for removingthe proj ect@- ing iin-in' ax precise manner`I and with greater economy-jthan under existingmethods.

Witlithis object* in View: theprincipali;*featuren ofj the i invention comprises-a separable dieV Whichthe heel blank is received, the die having; upwardly projecting edges out-off'ftiie when the` dieis presentedL to` rollers; An irri-portantv feature 4 of construction is the manner in whichr metri'cally,` andl iirgenerali substantially along theggreatest dimension-of thearticle: IIn the case'Y oflaheel, ftiiessplitpreferablyextends diagonally* Y from-onelcorneracross--theheel.' The purpose otthis-ffeature-- is to'- avoidi the necessityof aecurately placing the articleinwthe diei-by hand.

V@then"features off the'y inventionV comprisel a safety mechanism to- -prevent injury-y iff'thc heel* isfmitr properly-seated the die, an automatic lubricating device-tor facilitate positioning of the heel'lwithin' the die; and a brushV for cleaningv the severed-@Hiram the'heel'. VStillfurther-features;comprisecertairrnovellfeaturesofeonstruc-L tion and-` arrangement Which-'are hereinafterdescribed and;partieularlyfdened intheclailns.

InL-.tneaceompanying drawings IFig. `1 is-an ele-- vatiorr ef ltherileftV` side of`k preferred form of machinef'ontrimming-TubDermeelS; Fig. 2=-is a; plan View; Fig. 3 is an elevation' offtheright side-;-Figs. 4 and are: details illustrating the operation of the-.diestfflig- 16- isa:y detail sectional` elevation showing the-mechanism forA cuttingfthe-fln from the lieelf;` Figs. Fand 8 are `details-ofthe lubricating rneehanisn;2 and`Fig; 9 -isa diagram illustrat-L ing themannerpflocating a heelinthet die and- Fig; lil-is a? detailshowing theisevera'nce ofitlie n frornthe-heel The illustrated emiledimentY of# the invention comprises-a:` fra-me '|21having guidesv Ht -withi'n which slides a reciprocating carriage l carrying thefseparable-diemembers |18. Asi-shown in Fig. 2 tnefearriagefisrprovided- Witlfrtwo dies* wherebyv a; pairoi?-` 'h-eel'sl may" beV trimmed simultaneously; Each die corrmses a stationaryl portion 20 tatie-liceiirrtliedie;Av

mounted4 onlthecarrage: and a laterally. movable portion .22Jnorma11yheld; apart from thelstatione aryfportionhy-means ofL spr-ingsll As 'shoWrr-in` Figs. 2; @and 5th@ splitbetween tice-portionsA IB and- 2'0-offeach die extends longitudinally; of-'the macninebut the dies are.I placed at'Y an-angleso that the: split is generally f diagonal of"` the dief In. Figs. 2' and'- thedies are-shown opemforfre ceptionof funtrimmedrheels. Fig. 4 illustratestheposition of the die during an intermediate! tion. of|- their reciprooation, when tnedies are closedi by: meansoff cams 2t: engaging' rollers-l 2@ onlthe slidingportions` 22J offthe-de. In operation-a heel blankf is placedI in each` die* witlof-the iin-extending above the-edges. As shown in Figs; 61and-1'0; theouter edges ofV the dies-are extended upwardly tofform cuttingsedgesg When the dies are closedfbythe cams Ziet/'hea'e-severedirom thej blanks byfmeans off rollers shown irl-Figs; 1^ and16fthero1lers-are joui@ naled in` accurately` placed pillow: blocksV 34C. whereby-the roll-ersare causedy to rideovertlie cutting edges 3&4,- with theproper Ypressuretosever then from the heel'. As shown Fig. --2Veachroller'4 is made of bre anlis preferably-fabrie cated bystack-ing a seriestof lfibre;disksogrraA central rod 36. The rollersl V32'- a-re notpositivellb driven lont sinmly"rolled.L over the edsefofA the dies as the latter p ass beneathtl'rerolls: Beyond@ the -roll's isa rotatingbrusrr SBUWh-iclr positively: driven in v th eid-ire ctionindicated` itx-Eig: 1', namely such a direction that the.rotation` will separate-the severed `iin Afrom the heer lolariltu and throw it rearwardly; that istoward the-left. in Fig;` 1f. Itwill `beunderstood@ti'latftlie iin'inaf` not becompl'etely severedfromthe bla-nk bythe. cuttir'r'g` operation; but -theremay be places Whore the: iin' is? stillY held to thejblank: The brush- 38 engages portionsv of` the progressivelyl asf-the table- -isfed= underti1e--brush= Hence;the bresil actsv :torpull --or-i stretch the and tea-ritfrorn:` theblank Lat any points'whereitA may-gemein attaoiiedto-theblankz Y Y 0n; further passage of the carriage rearward-ip; the-.dies opensincej, as indicatedi-in-EigfZ, themes-- ing cams 26*l terminate infimec iiat'el-yfbeyond# the. bruslr 38. Atftheendiofsthe strokethehels are.. ejected from the-dies; To this end each-die is provided, with" anejector- 4191 comprising a freely sliding: rodi @arri-ec :by eeen die adaenttetn line offseparationothedie; Asolearly indicated inv Fig. @the ejector mdf-normally has itstop face 421 fush-with-the'bottom" surface of-- the carriage sothat it does notinterferewitn the; pncmgf At the end of the carriage stroke the ejectors 40 are positioned immediately above fingers 44 on a rod 46 which is quickly rotated in a counterclockwise direction by means of a solenoid 48. The solenoid is energized at the proper time by a suitable switch 49 actuated when the carriage is in the proper position. This action throws the heels upwardly and clear of the dies so that on the retracting motion of the dies, the heels will fall clear of the dies, and on a chute 50 from which they are discharged into a suitable bin. If the heels should fall back into the retreating dies they will be thrown out upon contact with the rotating brush.

The drive mechanism is shown in Fig. 1. The motor 50 drives an intermediate pulley 52 through a belt 54. The pulley 52 is connected by av belt 56 with a pulley 58 connected through a clutch B0 with a belt 62 to drive the large wheel 64. The wheel 64 is provided with an eccentric pin 65 slidingwithin a groove 68 of a lever 'I0 which is connected by a link 12 with a tail piece 'I4 depending from the carriage 6. Thus, rotation of the wheel 64 reciprocates. the carriage i6 back and forth. The intermediate pulley 52 is mounted on the same shaft with a gear 16 driving a gear 78, rotation `of which is transmitted through a pulley 80 and belt 82 to a pulley 84 on the shaft of the brush 38.

The clutch 60 is operated by a treadle 86 connected through a bell crank lever 88 and a sliding separable link 90 (to be later described) and a cable 92 with the clutch 00. The details of the clutch are not shown and it will sufi-ice to state that upon depression of the treadle the clutch is closed to cause a driving motion of the wheel 64 and hence of the carriage.

`Since the chute 50 is in the path of the upper end of the oscillating lever l0, an opening is provided in the chute and the opening is normally closed by a plate 96 being held in closed position byaspring 98 connected between the upper end of the chute and the bottom of the plate. Near the end of the motion of the lever '|0 the lever engages the top of the plate and permits the latter to slide downwardly. By the time the heels are ejected and'fall on the chute the lever 10 has retracted suliciently to permit the plate 95 to close the opening. c j A safety device is also provided to stop the machine if a heel is not properly located in the die and to prevent the workman from injury by catching his fingers between the dies and the rollers. The safety device comprises a plate pivoted as indicated in Fig. 3 immediately in front of that part of the frame which carries the supportrfor the roller bearings. The plate is so arranged that a heel of normal height will just pass under it. The plate is mounted on a shaft |02 having at its outer end an arm |04 which is connected by a chain |06 with a bell crank lever |08. The lever is connected by a rod ||0 with a latch member I2 which forms a part of the seprable link 90. Thus, if the plate |00 is engaged by a heel which is misplaced because not properly located within the die or is engaged by the workmans hand, it swings and breaks the connection 90, throwing the clutch to stop the reciprocating movement of the carriage. A spring ||4 isv provided to restore the link |I2 to normal position. The two portions of the link will reestablish contact upon release of the treadle.

Attention has been directed to the-split of the die as shown in Figs- 1, 4, and 9.l In Fig. 9 the outline of the die is shown and the outline of a heel is indicated in dot and dash lines. It will be observed that accurate initial positioning of the heel is not required. If the die were split on a median line, the dimension from the breast to the rear of the die would be approximately the same as the corresponding dimension of the heel and it would be necessary for the operator to t the heel accurately into the die. 'By the present arrangement wherein the split extends asymmetrically from one corner and along substantially the longest dimension, the heel may be dropped in the die with regard only for its approximate location. Then upon closing of the die, the pressure of the sides against the heel, While the heel is positioned at the .corner I6 will cause the heel to swing into proper ultimate relation with the die.

A feature of the invention is in the means for lubricating the die. It has been found that the rear corner ||6 tends to pinch the rubber. To prevent this, a small amount of oil is placed at that corner during the retractive movement. To this end there is provided an oil reservoir |20 connected by a wick |22 with a brush |24. The brush is arranged for up and down movement by being mounted at the end of a pivoted bell crank lever |26, the bottom end of which is provided with a pivoted latch |28. Thus, on a rearward movement of the carriage as indicated by dotand-dash lines in Fig. 8 the latch swings ineffectively out of the way. Upon a forward motion of the carriage the front of the carriage strikes the latch |28 and brings the brush down at the proper time to'wipe the corners ||8 of the die. This dep-osits a slight amountof oil at the corner, so that when the dieA is later closed on a heel, the heel will freely assume the correct position in the die.

Having thus described the'invention, I claim:

l. A trimming machine for removing a projecting iin from a molded rubber article comprising a separable die having a peripheral cutting edge, means for closing the die, means for applying pressure to sever the fin against the cutting edge, means for feeding the die to the pressure applying means, a safety device including a pivoted member disposed immediately above the normal position of the article in advance of the feeding means, and connections operated by the safety device to stop the feeding means.

2. A trimming machine for removing a projecting fin from a molded rubber article comprising a separable die having a peripheral cutting edge. meansfor closing the die, means forv applying pressure to sever the iin against the cutting edge,

` a reciprocating table for fcedngthe die to the pressure-applying means, a plate ahead of the pressure applying means, and'pivoted lin a position immediately above the normal position of the article, and connections operated by motion of the plate to stop the table. y

Atrimming machine for removing a projecting fin from a molded rubber article comprising a vseparable die having a peripheral cutting edge, means for closing the die, means for applying pressure to sever the fin against the cutting edge, a reciprocating table for feeding the die to the pressure-applying means, a lubricant reservoir, and means for supplying lubricant to the die on a retracting movement of the die, said means being inoperative on a feeding movement of the die.

4. A trimming machine for removing a projecting nn from a molded rubber article comprising a separable die having a peripheral cutting edge, means for closing the die, means for applying pressure to sever the iin against the cutting edge.

a reciprocating table for feeding the die to the pressure-applying means, a lubricant reservoir, a wick to supply lubricant from the reservoir to the die, and a latch device operated by the table on a retracting movement thereof to bring the wick into proximity with the die, said device being inoperative on a feeding movement of the die.

5. A trimming machine for removing a projecting n from a molded shoe heel, comprising a two part separable die having a cutting edge, means for closing the die after insertion of the heel, and means for applying pressure to sever the projecting iin of the heel against the cutting edge of the die, the line of separation of the die extending from one corner of the shoe heel at the intersection oi side margin and breast, along an axis oblique to the axis of symmetry of the heel to the curved rear margin of the heel, at a point where the line of separation is substantially perpendicular to a tangent to said heel at that point.

6. A trimming machine for removing a projecting fm from a molded shoe part, the contour of which includes two corners and a curved marginal portion, said machine comprising a two part separable die having a cutting edge, means for closing the die following the insertion of a part to be trimmed, and means for applying pressure to sever the projecting iin against the cutting edge of the die, the line of separation of the die parts extending obliquely from one corner of said article to a point on the curved marginal portion most remote from said corner.

ARTHUR GREENBAUM.

REFERENCES CITED The following references are of record in the v file of this patent:

UNITED STATES PATENTS Number Name Date 330,913 Maxfield Nov. 24, 1885 518,596 Gibbs Apr. 24, 1894 613,397 Sanson Nov. 1, 1898 1,167,967 Campbell -Jan. 11, 1916 1,208,019 Roney Dec. 12, 1916 1,297,023 Simmons Mar. 11, 1919 1,308,479 Campbell July l, 1919 1,616,752 MacDonald Feb. 8, 1927 1,932,571 Blood Oct. 31, 1933 2,101,654 Sheehan Dec. 7, 1947 2,121,003 Balie Jan. 24, 1938 OTHER REFERENCES Miller: (Reissue) 12,809, June 9, 1908. Freeman: (Reissue) 20,203, Dec. 8, 1936. 

